Identification of cotton yarn and rayon yarn
1. Cotton yarn will not emit sparks when it burns, while rayon yarn will emit sparks, and the burning speed is faster than cotton yarn.
2. Cotton yarn moistened with water, its strength will not decrease, while rayon yarn moistened with water, its strength greatly decreases, and the wet strength is much smaller than the dry strength.
3. Put the cotton yarn and rayon yarn into a cup of water at the same time. Because rayon yarn has better permeability than cotton yarn, the rayon cotton yarn sinks into the bottom of the cup first, and the cotton yarn is a little slower (but it is worth noting that it has just been pre-treated and has not been The cotton yarn washed by the desizing lye solution will immediately wet and sink into the water due to the penetration of the alkali).
Using the above three methods together, we can distinguish cotton yarn from rayon yarn.
Discrimination of real silk and wool yarn
Both silk and wool yarn have the odor of burnt feathers when they burn, so we can’t tell the difference at this point, so we can only tell the difference by looking at the number of single fibers of the two. After the silk is dyed, part of it is taken off. Sericin, so the two silk fibroin are separated. If it is 1/22D/20D, the number of silk fibroin will become 14~16. In addition, we can quickly distinguish it from the gloss. In addition, from the spinnable count, 1/22D/20D has a yarn count of almost 500 counts. Such a yarn count can only be achieved by embedded spinning, so we can also distinguish from the thickness of the raw material.
Identification of Cotton Yarn and Bamboo Fiber Yarn
1. Cotton yarn will not emit sparks when burning, while bamboo fiber yarn will emit sparks, and the burning speed is faster than cotton yarn.
2. The strength of cotton yarn moistened with water will not decrease, while the strength of bamboo fiber yarn moistened with water will decrease, only about 60% of the dry strength.
3. Put the cotton yarn and bamboo fiber yarn into a cup of water at the same time. Because the permeability of bamboo fiber yarn is better than that of cotton yarn, the bamboo fiber yarn sinks into the bottom of the cup first, and the cotton yarn is a little slower (but it is worth noting that just before passing Treatment, the cotton yarn that has not been washed with the desizing lye will immediately wet and sink into the water due to the penetration of the alkali).
4. The cross-sectional shape under the electron microscope is different.
